Allen w



(No Model.)

A. W. RGSE. E1eot1jio-Speaking Telephone.

No. 231,362. Patented Aug. 17,1880,

V lle/l. Wfl-i058, Z) Q/l By /wls afm-MUS.

v Y WQM @MW N. PETERS, FHOTO-LITHDGRAFHER. WASMKNGTON D C UNTED STATES PATENT OFFICE.,

ALLEN W. ROSE, vOF NEW YORK, N. Y., ASSIGNOR TO CHARLES A. GHEEVER, OF SAME PLAGE.

ELECTRIC SPEAKING-TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 231,362, dated August 1'7, 1880.

Application led March 18, 1880. (No model.)

To all whom it may concern:

Be it known that I, ALLEN W. Rosa, a citizen of the Dominion of Canada, and a resident of the city, county, and State of New York, have invented certain new and useful Improvements in Electric Speaking-Telephones, of which the following is a specification.

My invention more especially relates to that class of instruments known as battery-telephones, by which the strength of a continuous current is increased or diminished by varying the pressure or area of conducting contactpoints or bodies through which the current passes. The apparatus most generally used for producing such variations consists, broadly stated, of a vibrating transmitting-diaphragm and a carbon button through which the current passes.

Experience has demonstrated that it is better not to attach the conducting-body permanently to the case of the telephone, but to mount it upon a yielding support allowing a certain amount of play. The well known Blake transmitter, in which the conductingbody is mounted on an adjustable spring, is a good illustration of this last-mentioned form of apparatus. Experience has, however, demonstrated even this form vof apparatus to be objectionable, it being difficult to permanently adjust the tension of the spring properly, and a very slight variation of such tension is often sufficient to prevent the proper workin g of the instrument.

The objects ot'myinvention, generally speaking, are to simplify the construction of the apparatus, to diminish its cost, and to increase its efficiency, which ends I attain by mounting two diaphragms, substantially parallelo each other, on a suitable casing or support, and interposing between them an independent conductor capable of corresponding t-o their vibrations.

The subject-matter claimed is hereinafter specified.

The diaphragme are electrically insulated from their support, and are preferably rendered adjustable with relation to each other.

The conducting-bodies employed by me pref-- erably consist of carbon buttons or contactpoints brought directly in contact with each other; but platinum disks or surfaces may be interposed between them, as is well understood.

In the accompanying drawings, Figure l represents a vertical central section through one form of my improved telephone, and Fig. 2 a diagram ot' the apparatus employed.

The details of construction shown being old and well known, except as hereinafter specified, need not be particularly described here.

Two diaphragms, A B, are inserted in a cavity in the casing, respectively mounted on elastic or yielding rings H, resting upon suitable shoulders in the casing.

Conducting bodies or contact points are shown in the drawings as consisting of carbon buttons D D', secured upon the inner faces of their respective diaphragms, with an independent electrical conductor, consisting of a platinum button or contact-point, F, interposed between and in contact with them, and mounted upon a support, E, which may consist either of a diaphragm, yielding arm, or spring, properly mounted upon the casin g, but electrically insulated from the line-wire or circuit-wires, one of which wires leads through a suitable binding-post, K, to the carbon button D, and the other through the binding-post K to the other button, D'.

The pressure of the diaphragms or the carbon buttons upon the interposed conductor may readily be regulated by means of the elastic supporting-rings or screw-connections above described, or by other well-known means.

Under the arrangement on circuit shown in the drawings the current will pass from one pole of the battery through one carbon button and the interposed conductor to the other button, and thence, through the primary circuit of the induction-coil, to the other pole of the battery, b, by which organization the continuity ot' the circuit is maintained.

The various methods of arranging my improved apparatus on circuit (other than that herein represented) shown in an application for Letters Patent tiled b v me October 27, 187 9, are the invention of Charles A. Gheever, of New York city, and consequently are herein disclaimed.

My application above mentioned shows two diaphragms with carbon buttons in dicach supported upon an elastic ring, and an reet contact with each other, Without the ininterposed independent conductor in electriterposition ot' an intermediate conductor, cal connection with each diaphragm, whereby which form ot' construction is conseqnentbY the proper relation of the various parts is 2o 5 not herein claimed. maintained.

I claim as of my own invention- 3. The combination, substantially as here- 1. The combination, substantially as hereinbefore set forth, of' two diaphragms, an ininbefore set forth, ot' two diaphragms, conterposed independent conductor, a battery, ducting-buttons or contact-points mounted con11ectingwires,an indnctioncoil,andalinez5 1o thereon, and an interposed independent eonwire.

ductorvibrating correspondingly with the con- In testimony whereof I have hereunto subtact-points to maintain the continuity of the scribed my name. circuit. A. W. ROSE.

2. The combination, substantially as hercin- Witnesses: I5 before set forth, of a sectional casing, an ad- DWARD CLARK, justa-ble screw-conncction, two diaphragms, JOHN (JoLTON.

le wi 

